Heydoniella vietnamensis, Narendran, T. C. & van Achterberg, Cornelis, 2016

Narendran, T. C. & van Achterberg, Cornelis, 2016, Revision of the family Chalcididae (Hymenoptera, Chalcidoidea) from Vietnam, with the description of 13 new species, ZooKeys 576, pp. 1-202 : 98-102

Taxon classification Animalia Hymenoptera Chalcididae

Heydoniella vietnamensis sp. n. Figs 143-144, 145-146

Type material.

Holotype, ♀ (RMNH), "S. Vietnam: Dak Lak, Chu Yang Sin N. P., Krong K’Mar, Mal. traps, 740-900 m, 2-10.v.2007, C. v. Achterberg & R. de Vries, RMNH’07”. Paratype (IEBR): 1 ♀, same data as holotype.

Diagnosis.

This new species differs from the only other known species, viz. Heydoniella sarawakensis Narendran in having: 1) head with transverse carina anterior to scrobe below anterior ocellus absent (in Heydoniella sarawakensis with a transverse carina below anterior ocellus); 2) POL 7.5 × OOL (in Heydoniella sarawakensis POL about 3.7 × OOL); 3) clava 1.5 × as long as its width (in Heydoniella sarawakensis clava 1.8 × its width); 4) length of scutellar prolongation 0.5 × width of scutellum (in Heydoniella sarawakensis length of scutellar prolongation 0.3 × width of scutellum); 5) T1 1.1 × its width (in Heydoniella sarawakensis T1 2.1 × as long as wide), and 6) CC 4 × as long as MV (in Heydoniella sarawakensis CC 5.3 × as long as MV).

Description.

Holotype, ♀, length of body 3.2 mm.

Colour. Black; eyes and ocelli reflecting gray; scape, pedicel and anellus pale brownish yellow; F1 to F3 pale reddish brown; remaining segments of antenna dark with apex of clava brownish. All coxae black; all trochanters pale brown; fore and mid femora pale brownish yellow except median part externally black; fore tibia and tarsi pale yellow; mid tibia dark brown with base and apex pale yellow; mid tarsi pale yellow; hind femur completely black; hind tibia black with apex and base pale brown; tarsi pale brown; wings hyaline with two infumate bands on fore wing; veins dark brown; pubescence on body silvery.

Head. Width of head in anterior view 1.4 × its height; width in dorsal view 2.4 × its length, almost equal to width of mesosoma (including tegulae); face concave, scrobe deep, cross reticulate-striate, margins ecarinate, weak thin transverse carina below anterior ocellus absent; parascrobal area with deep setigerous close pits, eyes with sparse short pubescence; MS weak but distinct, irregular; maximum diameter of eye in lateral view 2.6 × malar space; pre-orbital carina running upwards and crossing to posterior part of vertex through OOL and meeting post-orbital carina; temples nar row; vertex narrow; occiput moderately excavate, deeply declining from ocelli, deeply punctate; POL 7.5 × OOL; AOL 3 × OOL, shorter than LOL; shortest distance between eyes in dorsal view = twice POL. Antennal segments shorter towards apical part; antennal formula 11173; scape not reaching anterior ocellus; relative L:W of antennal segments:scape = 22:5; pedicel = 5:3; anellus = 3:3; F1 = 3:4; F2 = 4:4; F3 = 5:4; F4 = 4:5; F5 = 4:5; F6 = 4:6; F7 = 4:6; clava = 9:6.

Mesosoma. Mesosoma convex, with distinct, deep, umbilicate, setigerous pits, interstices between pits ecarinate, weakly reticulate except strongly reticulate anterior part; posterior margin of pronotum widely concave; notauli shallow, with pits; tegulae pubescent; axillae with stronger and relatively longer pubescence than those of scutellum; scutellum length including apical prolongation 1.6 × its width, apex prolonged posteriorly, slightly exceeding base of metasoma, length of apical prolongation 0.5 × width of scutellum; apical prolongation with a median raised ridge. Propodeum with a pair of distinct submedian carinae; plical carina strongly developed, interstices distinctly alveolate and with deep pits; lateral teeth indistinct.

Wings. Fore wing 2.3 × as long as its width; CC 4 × as long as MV; PMV shorter than STV, with 2 infumate bands connected medially, disc densely pilose; speculum absent.

Legs. Hind coxa with an anterior dorsal tooth and a bunch of characteristic dense white setae dorsally (Fig. 145); hind femur with a row of teeth on ventral margin, inner side without tooth or protuberance; hind tibia with an extra outer carina.

Metasoma. Metasoma as long as mesosoma, subovate, T1 1.1 × its width; exceeding middle of metasoma with two submedian carinae separated by deep fovea basally, outer pair of carinae longer than inner pair.

Male. Unknown.

Host.

Unknown.

Etymology.

Named after Vietnam, the country where the holotype was collected.